Valve system



FIG. 1 is a perspective view of a valve system showing our new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a top plan view thereof.

The broken lines illustrated in the drawing views are included to showunclaimed environment only and form no part of the claimed design.

CLAIM The ornamental design for a valve system, as shown and described.